This Supertech Exhaust Valve is designed specifically for the Mazdaspeed 3 and 6 MZR DISI engines. It features a 5.98mm stem diameter for stock valve guide and seal fitment but tapers to 5.5mm at the top in order to fit with the stock valve train or the Supertech upgraded springs and retainers. Uses factory OEM guides and seals only.
Supertech manufactures a variety of high performance Inconel valves for many applications. These valves are manufactured from a Nickel base super alloy material (Inconel 751 or Nimonic 80A) this material is chosen because it is designed to withstand very high temperatures. These valves feature a one-piece forging, hardened tip, and our “superfinish” stem. The Mazdaspeed specific valves feature a dished style valve face.
Supertech Inconel valves are extremely popular choice for turbos and supercharger applications